Improved die for making- horseshoe-toe-calks



Vaima@ m altitud ,States n galant Itillli" l P. F. BURKE, OF WORCESTER, ASSIGNOR TO THOMAS DOOLEY, OF

BOSTON, MASSACHUSEIWS.' j v Leners Pfam No. 92,259, darai .my c, 1869.

The Schedule referred to in these Lettera Patent and making part of the sains.

To all whom it 'may concern.- l K l Be it known that I, P. F. BURKE, of Worcester, in the county of NVorcester, and State of Massachusetts, have invented Improvements in Punching-Dies fox-Toe- Galks; and Ido hereby declare that the following, taken in connect-ion with the drawings which accompany and form part of this specification, is a description of my inventionsutcient to enable those 'skilled in the art to practise it. Y

It has long been a common practice among mechanicians to make solid punches, to co-operate with open beds or dies, for the purpose of punching pieces of metal, ofany given desired form, out of larger pieces of metal, using for the purpose one or more punches, operating at the same time; and where the surface ot' the metal to be punched varied from a plane, the surfaces ofthe punch or punches, and f the open die or dies, coming into contact with the metal, have been made the counterparts ofthe surfaces of the metal to be punched, so that the punchngs produced had the original forni of the metal, as well as the form of the punch and open die.

1t follows, then, that only peculiarities of the detail of the construction and arrangement of punching-dies can now oti'er points of novelty, and it is in details of construction and arrangement in punching-dies that the subject of my present invention is found.

Letters Patent No. 78,581 were granted, June 2, 1868, for theinvention of Thomas Dooley, for a calk or calkblank, having a peculiar relative disposition of iron and steel, and the invention herein set forth relates to peculiarities in punching-dies adapted for punching, from rolled bars such as are described by Dooley, toe-calks or toecalk blanks.

. Figure 1 shows an end view of a bar of the material from which toe-calks are to be punched, the bars being of considerable length, part of one being shown in plan in Figure 2, the red lines in said figure showing the division-lines made by the punching-operation in forming toe-calks, the colored portion exhibiting the waste, or material to be reworked.

Figure lshows the punches, and their stock or carrier in end view,

Figure 4 showing the same in` plan. l

Figures 5 and are respectively a plan and an end view of the open die orbed used in connect-ion with the punches. I

Each punch is formed from bar-steel, the piece l), which punches the calk steady-pin, being integral with theibody u, of the punch, the whole of which is made by planing a bar of considerable length to the form of crosssection seen in ig. 4,'n1arkeda b, the punches being cut of the right length frem the bar, and after being formed at one end to tit the surface of the toecalk bar, are hardened.

The punch-carrier socket or holder is made with'a shank, c, to t into a reciprocating plunger of a powerful punching-press, a head, d, being forged integral with the shank c. l In the head d, on opposite sides thereof, are planed seats for the reception oi' the punches, the ends of the punches opposite their punching-ends or faces resting solidly against square shoulders of the head (l. Y

On ea'h side of the head d, and resting against the bodies a of the punches, are located clamping-plates, e, through which and the head l and the punch-bodies a a, pass the clamp-bolts f f.

The projections b are preferably removed from the bodies a of the punches, where these enter the head d, and it will be seen, that if lthe cutting-face of either of the punches is injured, it maybe ground or sharpened v anew, and the new face brought into position by afiliing-piece, placed between the other Iend of the punch- Iand its seat or shoulder, on the head fl.

It will be seen that the punches are nt located opposite each other in their carrier, but are oiset just the length of one calk, the plane of the line 1 1, of one punch, being coincident with the plane of the line`2 2 of thejother punch, as shown in fig. 4.

This offset arrangement of the punches enables me to make use of two holding-bolts, in place of one only, as wonid be theeaseif the punches Ahad an arrangement opposite each other, and said arrangement also gives a holder or carrier of ni uch greater strength than it would have if the punches were set opposite each other. But the advantages of the ot'set arrangement are more marked with reference to the bed or open die y lili the diagram, Figure 7, is shown an open die, similar to the die seen in iig. 5, except that the openingsl to receive the punches are opposite insteadot" oi'set, and

, it will readily be seen by practical men, that the formationrillustrated in iig. 7 is too weak to withstand the force necessarily exerted in punching out toe-calks, and that the die would breakat once, on the lines xx. But where the arrangement of the punches is oi'set as described, and as shown in fig. 4, and the die ismade with its openings correspondingly oset, as intig. 5, it will be seen that the die g has strength requisite to the pertbrinanoe of its functions.

On the surface ot' die g is xed the piece li, which serves to guide and coniine the bar from which the toe-calks are to be punched, and to strip the wastev from the punches when they rise out of the die, and also to act as a stop against which the metal abuts, so that the bar can be shoved ahead under the punches, after each action thereof exactly the length of one toe-calk. Y

The piece h projects above die g, like a bridge over the path of the bar fron; which the calks are punched,

the part marked Ii. allowing one rib, j, of the bar, to

pass under it,vwhi1e rib lc of the bar abuts against the part of the bridge marked l, which does not leave space enough between its lower surface andA the uppersurface of the die g to permit the passage of rib k. sequence of the cutting of the punches ou the bar of metal is numerically indicated in fig. 2.

1f the punches were made integral with each other and with their carrier, their rst cost would largely exceed theI cost of the construction shown, and any injury of one of the punches would ruin the entire combination for use. But in my improved construe tion, it' either of the punches is injured, it may be repaired, or it' beyond repair, it may be replaced with but comparatively small expense.

The ease and facility with which each separate part TheV of my combination may be tempered, will at once he recognized by practical workers of steel.

I claim, for pnx1cliingdies for toe-calks, the oset arrangement oi the punches and the openings in the die, substantially as shown and described. y A

Alsothe non-integral structure, consisting ot` the carrier c (l, separate p1n1ching-cutters al b, a b, clamping-plates e c, and bolts f f, substantially as and for the purposes specified.

Also, the bridge h, combined with the die g, and opi erating substantially as and for the purpose specilied. \Vitnesses: P. F. BURKE.

J'. B. CROSBY, Farmers GoULD. 

